The Halo I is the original headband that started it all. The design is a headband that ties in the back to create a custom fit for the wearer and includes all the features that make Halo Headbands the best functioning headbands on the market. Dryline Fabric and the patented Sweat Seal Grip Technology make this headband popular with cyclists, runners, lacrosse players and any athlete looking for a custom fitted headband. Will not lose shape, form, or stretch out. Made in the USA, one size fits both men and women.